Noise Abatement Technology Options for Conventional Turboprop Airplanes.

Abstract

The practical application of noise control technology to new and derivative conventional turboprop airplanes likely to come into service in the 1980's has been analyzed with a view to determining noise control cost/benefits. The analysis identifies feasible noise control methods, applies them to four study airplanes, and presents the noise reductions in terms of the equivalent perceived noise level at takeoff, sideline and approach locations, and the effect on the area within selected EPNL contours. Noise reductions of up to 8.3 dB for takeoff and 10.7 dB for approach are calculated for the study airplanes but, for most cases, the changes are less than 5 dB. Weight and cost increases associated with the noise control treatments are determined under the assumption that they are no changes to airplane performance or fuel consumption. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1981
Accession Number
ADA101828

Entities

People

  • John F. Wilby
  • William J. Galloway

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircraft Industry
  • Aircrafts
  • Airframes
  • Composite Materials
  • Engine Noise
  • Far Field
  • General Aviation Aircraft
  • Mach Number
  • Measurement
  • Noise Reduction
  • Propeller Blades
  • Propeller Noise
  • Shrouded Propellers
  • Turbofan Engines
  • Turboprop Engines
  • Turboshaft Engines

Readers

  • Acoustics.
  • Aerospace Engineering
  • Systems Analysis and Design